Echinoderms

Question 1

How many germ layers to echnioderms have?

Answer 1

3

Question 2

What is the body symmetry of echnioderms?

Answer 2

radial

Question 3

Do echnioderms have segmentation?

Answer 3

no

Question 4

What is the coelem of echnioderms?

Answer 4

true coelem

Question 5

Describe the nervous system of echnioderms

Answer 5

cephaliziation absent. has nerve net and eyespots

Question 6

Describe the skeletal system of echnioderms

Answer 6

bumpy endoskeleton covered with spiny skin (made from calcium carbonate)

Question 7

Describe how echnioderms feed

Answer 7

they have a mouth on underside. can be carnivores, herbivores, or detrivores

Question 8

Describe the excretion of echnioderms

Answer 8

tube feet

Question 9

Describe the circulatory system of echnioderms

Answer 9

water-vascular system (no blood)

Question 10

Describe respiration of echnioderms

Answer 10

filter oxygen from the water

Question 11

Are echnioderms sexual or asexual?

Answer 11

sexual

Question 12

Examples of echnioderms

Answer 12

starfish, brittle stars, sea urchins & sand dollars, sea cucumbers, basket stars, sea lillies & feather stars

Question 13

Are starfish really fish?

Answer 13

no

Question 14

How many rays to most starfish have?

Answer 14

5

Question 15

What are the pincers of starfish called?

Answer 15

pedicellarians

Question 16

Do starfish have spines?

Answer 16

yes

Question 17

Do starfish have eyespots?

Answer 17

yes

Question 18

What do starfish do when they lose parts?

Answer 18

they regenerate them

Question 19

What is the circulatory system of starfish

Answer 19

water vascular system

Question 20

How do starfish feed?

Answer 20

stomach pushes out of the mouth, over food. enzymes digest food and stomach absorbs it. stomach goes back into starfish

Question 21

What is a madreporite?

Answer 21

disc shaped opening in the body where water enters & exits

Question 22

What does the ring canal do?

Answer 22

connects madreporite to radial canals in rays

Question 23

Where are radial canals?

Answer 23

in arms, connect to tube feet

Question 24

What are tube feet

Answer 24

hollow tubes with suction cups on end, poke out of the skeleton, retract if you pick them up-sensitive to touch, used to move, hold prey & open shells

Question 25

Brittle stars are similar to what animal?

Answer 25

starfish

Question 26

What do brittle stars do when the are in danger?

Answer 26

they lose a ray and regenerates it later

Question 27

how to brittle stars feed?

Answer 27

they are filter feeders

Question 28

How are sea urchins and sand dollars shaped?

Answer 28

globes or disk shaped; no rays

Question 29

Are sea urchins carnivores or herbivores?

Answer 29

herbivores

Question 30

What do sand sollars look like?

Answer 30

flat, covered with spines when alive

Question 31

What do sea cucumbers look like

Answer 31

slug-life bodies with leatery skin & tentacles around the head, tube feet to move

Question 32

What do sea cucumbers do when in danger?

Answer 32

expel internal organs for predators to eat. the internal organs then regenerate

Question 33

Sea cucumbers make up __% of deep-sea ecosytem

Answer 33

90%

Question 34

Basket star is a relative of what?

Answer 34

starfish

Question 35

What do basket star arms look like?

Answer 35

long and branching

Question 36

How do sea liles and feather stars feed?

Answer 36

filter feeding

Question 37

What do sea lilies and feather stars look like?

Answer 37

long, feathery arms

Question 38

What is the oldest class of echinoderms?

Answer 38

sea lilies and feather stars